Identification:
This variant of Pseudobiceros hymanae—referred to as form A—is a striking polyclad flatworm with a velvety brown to dark reddish background. It features a pair of fine, pale longitudinal lines running down the dorsal surface and may display irregular mottling or subtle spotting. Its ruffled margin is typically edged in pale orange or white, creating a soft contrast against the darker body.

Size:
Typically around 3 – 5 cm in length.

Habitat:
Found on coral rubble, sandy reef slopes, and under ledges, often crawling openly during the day.

Depth Range:
2 – 20 meters

Diet:
Feeds on sessile colonial invertebrates, like ascidians or sponges, using its eversible pharynx to externally digest prey.

Reproduction:
Like other Pseudobiceros, it is a simultaneous hermaphrodite. During mating, individuals engage in penis fencing, a ritual in which the “winner” inseminates the other.

Fun Fact:
This flatworm is named in honor of the renowned zoologist Libbie Hyman, who was one of the first to classify and describe many flatworm species.